netdev - Re: [PATCH net-next 01/38] selftests/net: add lib.sh

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Date: Fri, 24 Nov 2023 15:05:18 +0100
From: Petr Machata <petrm@...dia.com>
To: Hangbin Liu <liuhangbin@...il.com>
CC: <netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>, "Jakub
 Kicinski" <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>, "Paolo
 Abeni" <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>, David Ahern
	<dsahern@...nel.org>, <linux-kselftest@...r.kernel.org>, Po-Hsu Lin
	<po-hsu.lin@...onical.com>, Guillaume Nault <gnault@...hat.com>,
	Björn Töpel <bjorn@...osinc.com>, Ryan Roberts
	<ryan.roberts@....com>, Andrew Morton <akpm@...ux-foundation.org>, "Mark
 Brown" <broonie@...nel.org>, Luis Chamberlain <mcgrof@...nel.org>
Subject: Re: [PATCH net-next 01/38] selftests/net: add lib.sh


Hangbin Liu <liuhangbin@...il.com> writes:

> Add a lib.sh for net selftests. This file can be used to define commonly
> used variables and functions.
>
> Add function setup_ns() for user to create unique namespaces with given
> prefix name.
>
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> ---
>  tools/testing/selftests/net/Makefile |  2 +-
>  tools/testing/selftests/net/lib.sh   | 98 ++++++++++++++++++++++++++++
>  2 files changed, 99 insertions(+), 1 deletion(-)
>  create mode 100644 tools/testing/selftests/net/lib.sh
>
> diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
> index 9274edfb76ff..14bd68da7466 100644
> --- a/tools/testing/selftests/net/Makefile
> +++ b/tools/testing/selftests/net/Makefile
> @@ -54,7 +54,7 @@ TEST_PROGS += ip_local_port_range.sh
>  TEST_PROGS += rps_default_mask.sh
>  TEST_PROGS += big_tcp.sh
>  TEST_PROGS_EXTENDED := in_netns.sh setup_loopback.sh setup_veth.sh
> -TEST_PROGS_EXTENDED += toeplitz_client.sh toeplitz.sh
> +TEST_PROGS_EXTENDED += toeplitz_client.sh toeplitz.sh lib.sh
>  TEST_GEN_FILES =  socket nettest
>  TEST_GEN_FILES += psock_fanout psock_tpacket msg_zerocopy reuseport_addr_any
>  TEST_GEN_FILES += tcp_mmap tcp_inq psock_snd txring_overwrite
> diff --git a/tools/testing/selftests/net/lib.sh b/tools/testing/selftests/net/lib.sh
> new file mode 100644
> index 000000000000..239ab2beb438
> --- /dev/null
> +++ b/tools/testing/selftests/net/lib.sh
> @@ -0,0 +1,98 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +
> +##############################################################################
> +# Defines
> +
> +# Kselftest framework requirement - SKIP code is 4.
> +ksft_skip=4
> +# namespace list created by setup_ns
> +NS_LIST=""
> +
> +##############################################################################
> +# Helpers
> +busywait()
> +{
> +	local timeout=$1; shift
> +
> +	local start_time="$(date -u +%s%3N)"
> +	while true
> +	do
> +		local out
> +		out=$($@)
> +		local ret=$?
> +		if ((!ret)); then
> +			echo -n "$out"
> +			return 0
> +		fi
> +
> +		local current_time="$(date -u +%s%3N)"
> +		if ((current_time - start_time > timeout)); then
> +			echo -n "$out"
> +			return 1
> +		fi
> +	done
> +}

This is lifted from forwarding/lib.sh, right? Would it make sense to
just source this new file from forwarding/lib.sh instead of copying
stuff around? I imagine there will eventually be more commonality, and
when that pops up, we can just shuffle the forwarding code to
net/lib.sh.